Sahih Bukhari | Volume 8 | Hadith Number 316

Narrated by 'Amr
Ibn 'Umar said, "By Allah, I have not put a brick over a brick (i.e. constructed a building) or planted any date-palm tree since the death of the Prophet." Sufyan (the sub narrator) said, "I told this narration (of Ibn 'Umar) to one of his (Ibn 'Umar's) relatives, and he said, 'By Allah, he did build (something.' "Sufyan added, "I said, 'He must have said (the above narration) before he built."